JP2018041291A - Data recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data recording method capable of efficiently recording data on a record medium using a file system.SOLUTION: The data recording method includes: a file data generation step to select a first file 201 from plural input files and store the data in the first file in a piece of data in a pack file 213 which is generated according to a file system configured on a record medium; a management information generation step to record the management information in the first file on the pack file in a management file on a management file; and a record step to record on a record medium the pack file and the management file.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a data recording method for recording data on a recording medium.

  In Patent Document 1, data to be written in a write-once optical disc system is stored in a temporary storage device, and when the data length of the write target data satisfies a predetermined condition, the data is actually recorded on the write-once optical disc. Technology is disclosed. Patent Document 1 describes that a small amount of data can be recorded on a write-once optical disc by the above technique.

  In Patent Document 2, data to be recorded on an optical disc in an optical disc recording apparatus is compressed in advance and stored in a temporary storage device, and an actual optical disc is recorded according to the amount of data stored in the temporary storage device. Techniques for controlling are disclosed. Patent document 2 is explaining that the effect of suppression of power consumption is acquired by said this technique.

Japanese Utility Model Publication No. Hei 4-49356 JP 2000-11517 A

  When data is recorded on a recording medium using a file system in units of files, data (file system management information) for managing the file is recorded together with the file data body in the recording device. For this reason, when the number of files to be recorded on the recording medium increases, the file data body and the file system management information of the file need to be recorded for each file, which may reduce the data recording speed. In particular, when a large number of files having a small data size are recorded, the influence of this problem becomes large.

  In view of the above problems, the present disclosure provides a data recording method for efficiently recording data on a recording medium using a file system.

  A data recording method according to the present disclosure includes a file data generation step of selecting a first file from a plurality of input files and storing data of the first file into pack file data generated according to a file system configured on a recording medium And a management information generating step for recording management information of the first file on the pack file in the management file, and a recording step for recording the pack file and the management file on the recording medium.

  The data recording method according to the present disclosure makes it possible to efficiently record data on a recording medium.

Configuration diagram of a data recording system described in an embodiment The figure explaining the recording system at the time of recording data on the recording medium demonstrated in embodiment The figure explaining the size of the pack file explained in the embodiment The flowchart which shows the process at the time of producing | generating the pack file demonstrated in embodiment Figure when creating a pack file without changing the directory described in the embodiment Figure when creating a pack file directly under the root directory described in the embodiment

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

  The inventor provides the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and is not intended to limit the subject matter described in the claims. Absent.

(Embodiment 1)
FIG. 1 is a configuration diagram of a data recording system described in the present embodiment. The data recording system 100 includes a personal computer (PC) 101 and an optical disk drive 110.

  A personal computer (PC) 101 controls the optical disc drive 110. Specifically, the personal computer (PC) 101 instructs the optical disc drive 110 to record data or read data. In this embodiment, a personal computer (PC) 101 is illustrated, but the contents described in the present application are not limited to this.

  A personal computer (PC) 101 includes a processor 102, a memory 103, a hard disk 104, and an interface 105.

  The processor 102 controls the entire personal computer (PC) 101 and also controls the optical disc drive 110. The processor 102 performs predetermined control by operating software (execution program) stored in the memory 103, the hard disk 104, or the like. The processor 102 can be realized by a central processing unit (CPU), a programmable logic device (PLD), a digital signal processor (DSP), or the like.

  The memory 103 holds a program that is software for operating the processor 102 and is used as a temporary data storage place when the processor 102 executes the program. Note that when the size of the data temporarily stored is larger than the capacity of the memory 103, the hard disk 104 may temporarily store the data in the same manner as the memory 103.

  The hard disk 104 is used as a storage place that holds a large volume of data or holds long-term data. In this embodiment, a case where the hard disk 104 is used will be described as an example. However, the contents described in the present application are not limited to this. Other storage modules such as a solid state drive (SSD) using a semiconductor element memory may be used. In this embodiment, the hard disk 104 is described as a place for storing file data to be recorded on the optical disk 114, but the contents of this embodiment are not limited to this. The file data may be supplied from another computer instead of the hard disk 104.

  The interface 105 is an interface through which the personal computer (PC) 101 communicates with an external device. Specifically, it can be realized by an interface such as USB (Universal Serial Bus) or SAS (Serial Attached SCSI). In addition, an interface using a wired Ethernet (registered trademark), a wirelessly connected WiFi, or the like may be used.

  The optical disk drive 110 realizes recording of data on the optical disk 114 and reading of data from the optical disk 114 in accordance with instructions from the personal computer (PC) 101. The optical disc drive 110 includes a controller 111, a memory 112, an optical head 113, an optical disc 114, and an interface 115.

  The controller 111 controls the entire optical disc drive 110. The controller 111 performs predetermined control by operating software (execution program) stored in the memory 112 or the like. The controller 111 can be realized by a central processing unit (CPU), a programmable logic device (PLD), a digital signal processor (DSP), etc., like the processor 102.

  The memory 112 holds a program that is software for operating the controller 111, and is used as a temporary data storage location when the controller 111 executes the program.

The optical head 113 irradiates light to the optical disk 114 and receives light reflected by the optical disk 114 when recording data on the optical disk 114 or reading data. The optical head 113 converts information output from the controller 111 into irradiation light and outputs it to the optical disc 114 or outputs received light as data to the controller 111.
The optical disc 114 is a recording medium on which data is recorded. In this embodiment, the case where the optical disk 114 is used as a recording medium will be described as an example. However, the contents described in the present application are not limited to this. The optical disk 114 is a portable recording medium.

  The interface 115 is an interface through which the optical disc drive 110 (controller 111) communicates with an external device. Since the interface 115 is connected to the interface 105, the interface 115 needs to have the same specification and method as the interface 105. As with the interface 105, the interface 115 may be wired or wireless.

  In the data recording system 100 shown in FIG. 1, an example in which the personal computer (PC) 101 and the optical disk drive 110 are separate devices is shown, but the content disclosed in the present application is not limited to this. The optical disk drive 110 may be a part of a module of the personal computer (PC) 101. Further, other system forms may be used.

  FIG. 2 is a diagram for explaining a recording method when data is recorded on the recording medium described in the present embodiment. The processor 102 of the personal computer (PC) 101 reads the file 1 201 to the file N 204 as inputs corresponding to FIG. When the processor 102 reads these input files from the hard disk 104, each file data (file data 205 of file 1 to file data 211 of file N) and management information of each file system (management information of the file system of file 1) 206-File N file system management information 212) is acquired.

  When the processor 102 records the read input files 1 to N on the optical disc 114 as they are, the optical disc 114 is not limited to the file data 205, 207, 209, 211 of the input files 1 to N, but a file system necessary for each file. Management information 206, 208, 210, 212 are also recorded. Therefore, a set of 2N data is recorded on the optical disc 114. If the recording positions of the respective data are different on the optical disc 114, the controller 111 needs to change (adjust) the position of the optical head 113 relative to the optical disc 114 each time data is recorded. The process of changing the position of the optical head 113 takes time, and the data recording speed is slow as a whole.

  When the optical disk 114 is a type of recording medium that can be recorded only once (write-at-once), the directory information including the file is recorded each time the file system management information 206, 208, 210, 212 of the files 1 to N is recorded. In some cases, it is necessary to update For this reason, the method of recording the input file data as it is on the optical disc 114 may waste the recording area.

  The file system management information is information required when data is recorded in file units in the file system. The information constituting the file system management information includes, for example, the name of the file, the recording start position of the file on the recording medium, the physical data size of the file on the recording medium, the logical data size of the file, and the file There is information such as the position on the directory tree where is stored.

  In the present embodiment, before the processor 102 instructs the optical disk drive 110 to write data, the data is converted into data suitable for the optical disk 114 and the data writing is instructed. FIG. 2B is a diagram illustrating a state after being converted by the processor 102. Specifically, the processor 102 stores the input file data 205 of the file 1 to the file data 211 of the file N as file data 214 of a single pack file shown in FIG. When the processor 102 sets the file data of a plurality of input files as a single pack file, the file system management information can also be made one of the pack files 213.

  As shown in FIG. 2B, the pack file 213 is a file in which the file data 214 of the pack file is composed of the file data 205, 207, 209, 211 of the input file 1 201 to file N 204. It is.

  Recording only the N file data of the file 1 201 to the file N 204 on the optical disc 114 as one pack file 213 is inconvenient when it is desired to read only a specific file. Therefore, the processor 102 records information for individually managing and identifying the file data of the file 1 201 to the file N 204 on the pack file 213 in another file. Specifically, it is shown in FIG. The management file 216 corresponds to this.

  The management file 216 is a file that holds information for identifying individual input files when a plurality of input files are stored in one pack file 213. The management file 216 (management file file data 217) is recorded, for example, on the number of files stored in the pack file 213, the file name of each saved file, and the file data 214 of the pack file. Information such as an offset position indicating a start position to be started is included. As another method, the management file 216 may be realized as a data file of a database that centrally manages the above information.

  The processor 102 converts the file data 205 of the file 1, which is a plurality of input files read from the hard disk 104 as described above, to the file data 211 of the file N into one pack file 213. The processor 102 instructs the optical disc drive 110 to record the pack file 213 configured on the memory 103 onto the optical disc 114. As a result, a set of four data of pack file file data 214, pack file file system management information 215, management file 217, and management file file system management information 218 is stored on the optical disc 114. This can be realized by recording on the optical disk 114.

  That is, as the number of files stored in one pack file increases, data recording on the optical disc 114 can be performed more efficiently.

  In the present embodiment, a certain condition is set for the size of the file data 214 of the pack file. FIG. 3 is a diagram for explaining the size of the pack file described in the present embodiment. The processor 102 uses the first threshold value 301 and the second threshold value 302 when generating the file data 217 of the management file.

  The first threshold 301 is a preset threshold. The first threshold 301 is set by the user. More specifically, it is more preferable that the candidate for the first threshold value 301 can be selected by the user from several preset candidate values. For example, the first threshold value 301 is selected by the user from preset values such as 10 megabytes, 20 megabytes, 50 megabytes, 100 megabytes, 200 megabytes, and 500 megabytes. As another method, the first threshold value 301 may be determined based on the recording capacity of the optical disc 114. A larger value is set in the first threshold 301 for a disk having a larger recording capacity. Moreover, you may combine said method. For example, the first threshold value 301 initially determined based on the recording capacity of the optical disc 114 is presented to the user as a recommendation, and whether the user uses this recommended value or selects another value. May be set freely.

  The second threshold 302 is determined based on the first threshold 301. For example, a value that is substantially twice the value of the first threshold value 301 is set as the second threshold value 302. Of course, as another determination method, a method of determining using both the value of the first threshold value 301 and the property of the optical disk 114 as a recording medium, or the value of the first threshold value 301 and the optical disk 114 are mainly recorded. The second threshold value 302 may be determined by combining other methods such as a method of determining the type of data to be determined.

  Specific usage methods of the first threshold value 301 and the second threshold value 302 are as follows. The processor 102 generates a pack file in a range where the size of the file data 214 of the pack file is equal to or larger than the first threshold value 301 and smaller than the second threshold value 302. That is, when the size of the file data 214 of the pack file is less than the first threshold value 301, the processor 102 adds a new file and increases the file size. On the contrary, when the size of the file data 214 of the pack file becomes equal to or larger than the first threshold value 301, the processor 102 stops adding a new file to the pack file 213. The processor 102 adds new data to the pack file 213 on a file basis. By such processing, the processor 102 generates a pack file 213 having a data size equal to or larger than the first threshold value 301 and having a data size smaller than the second threshold value 302.

  By providing the first threshold value 301 or more and the second threshold value 302 as described above, the data size of the file recorded on the optical disc 114 is substantially unified. When the size of the file data recorded on the optical disc 114 is substantially unified, the recording on the optical disc 114 can be made efficient.

  Note that if the size of the file data 214 of the pack file is equal to or larger than the first threshold value in one file, the processor 102 may generate the file data 214 of the pack file by that file alone.

  In addition, when a new file is added to the pack file 213 (pack file file data 214), and the size of the file data 214 of the pack file exceeds the second threshold value 302, the addition of the new file is canceled. To do. If the second threshold value 302 is set to substantially twice the first threshold value 301, the size of the new file may be larger than the first threshold value 301. In this case In this case, the processor 102 may generate another pack file with a new file alone.

  FIG. 4 is a flowchart showing a process when generating a pack file described in the present embodiment.

  (Step S401) The processor 102 prepares a pack file 213 for recording data on the optical disc 114. Here, “preparation” means, for example, securing a temporary area when generating the pack file 213 on the memory 103.

  (Step S402) The processor 102 selects one file from a plurality of input files designated from the hard disk 104.

  (Step S403) The processor 102 copies the file data of the selected one input file to the temporary area for the pack file 213 secured on the memory 103. At this time, if there is already data of another input file, the data of the selected file is added to the end thereof.

  (Step S404) The processor 102 determines whether or not the size of the file data 214 of the pack file provided in the temporary area secured on the memory 103 is equal to or greater than the first threshold value 301. If the size of the file data 214 of the pack file is greater than or equal to the first threshold value 301, the processor 102 moves the process to step S405. On the other hand, when the size of the file data 214 of the pack file is less than the first threshold value 301, the processor 102 moves the process to step S402 and selects another different file from the input file.

  (Step S405) The processor 102 records the file data 214 of the pack file and the management information 215 of the file system of the pack file on the optical disc 114 via the controller 111. The processor 102 also records the file data 217 of the management file and the file system management information 218 of the management file on the optical disc 114 together.

  (Step S406) The processor 102 determines whether or not the recording has been completed for all the input files to be recorded on the optical disc 114. If recording has been completed for all input files, the processor 102 ends the process. If there is an unrecorded file, the processor 102 moves the process to step S401, and performs the process from step S401 onward for another new pack file.

  Next, how directory information is handled when generating a pack file will be described with reference to FIGS. 5 and 6. FIG. FIG. 5 shows a case where a pack file is generated with the directory described in the present embodiment as it is. FIG. 6 shows a case where a pack file is generated directly under the root directory described in the present embodiment.

  In the example of FIG. 5, the directory folder structure of the pack file recorded on the optical disc 114 adopts the directory structure of the input data file as it is. That is, the directory structure of the hard disk 104 is copied as it is on the optical disk 114, and a pack file including the original file is arranged under each directory. More specifically, for example, files A, B, and C under Folder-1 are stored in pack files “20130821-12230.arc” and “20150821-1230030.arc” that are also placed under Folder-1. ing.

  In this case, directory information is described in a directory entry corresponding to each of the file systems formed on the optical disc 114. That is, directory information managed by the file system is used as it is.

  In the example of FIG. 6, all pack files recorded on the optical disc 114 are placed under the root directory. In this case, information on the directory where the input file stored in each pack file is originally stored is stored in the management file 217 described with reference to FIG. 2B as information corresponding to each file. Yes. When reading the pack file, the original directory can be identified by reading the management file together.

  As described above, the data recording method described in the present application selects one from one or more input files. The file data of the selected input file is copied (added) to the pack file as the file data of the pack file. Each time a file is added, the data size of the pack file at that time is compared with a predetermined first threshold. If the data size of the pack file is less than the first threshold, another input file is newly selected, and the data of the file is copied (added) to the file data of the pack file. If this is repeated and the data size of the pack file is equal to or greater than the first threshold value, the file data of the pack file and the file system of the pack file in accordance with the rules of the file system configured on the recording medium of the pack file The management information is recorded on the recording medium.

  With the data recording method described in this application, a plurality of input files can be integrated into one pack file. Therefore, it is possible to combine the record of the management information of the file system necessary for each file into the management information of one file system. As a result, recording on the recording medium can be processed in a relatively short time.

  In particular, when the recording medium is a recording medium that can be recorded only once, for example, a write-at-once type recording medium such as a CD-R, DVD-R, or BD-R, it is updated each time file data is recorded. Since updating of information managed by the file system can be suppressed at a low frequency, useless consumption of the recording area can be suppressed.

(Modification to this embodiment)
As described above, the above embodiment has been described as an example of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed. Moreover, it is also possible to combine each component demonstrated in the said embodiment and it can also be set as a new embodiment.

  Therefore, other embodiments will be exemplified below.

  The method of storing and adding the input file data as it is when the processor 102 generates the pack file 213 has been described above. As another method, the processor 102 may perform compression processing (data amount reduction processing) when inserting data of the input file into the file data 214 of the pack file. Thereby, a larger amount of data can be recorded on the optical disk 114.

  When the processor 102 compares the size of the file data of the pack file with the first threshold, the amount of data after performing the above compression processing is used for calculating the size of the file data of the pack file. Is desirable. This makes it possible to record data with higher efficiency.

  Further, the processor 102 may use different algorithms for compression processing for each pack file. Thereby, the type of file to be input for each pack file can be selected in advance, and different compression processing can be used depending on the type of file. For example, in a pack file storing only text data, the amount of data can be reduced relatively greatly by compression processing. On the other hand, there is a case where the reduction amount of the data amount is relatively small even when compression processing is performed on moving image or image data. In such a case, it is possible to select that these pack files are not compressed.

  Further, although the processor 102 uses the same algorithm in compression processing, parameters (conditions) for setting the operation of the algorithm may be different for each pack file. As a result, it is possible to suppress the types of algorithms to be compressed prepared in the data recording system 100 and to generate pack files with different conditions. For example, in a pack file that requires a high compression rate, a compression rate priority parameter is set and the algorithm is operated. On the other hand, in a pack file that requires speed for reading and writing data, parameters are set with priority given to processing speed over compression rate, and the algorithm is operated. Thereby, it is possible to generate a suitable pack file according to the request required for each.

  If a compression algorithm is used to generate a pack file, the second threshold 302 has a more important meaning. That is, when compression processing is performed on an input file, the file size differs before and after the compression processing. Therefore, it is difficult to predict how much the size of the pack file will increase in advance when a new input file is stored (added) to the pack file. By providing the second threshold 302, it can be relatively easily determined whether or not a new input file can be added to the pack file.

  In the above description of the embodiment, the case where the second threshold value 302 is substantially about twice the first threshold value 301 has been described as an example. However, the contents of the invention described in the present application are not limited thereto. It is not limited. For example, the size of the second threshold 302 relative to the first threshold 301 may be determined according to the type of file to be input, for example, a file type such as a text file, a moving image file, or a data file. .

  In the above embodiment, the case where the data recording method is realized has been described as an example. However, the contents described in the present application are not limited to this. For example, the invention described in this application can also be realized as a data recording apparatus that records data on a recording medium.

  In that case, the flowchart (program) described with reference to FIG. 4 is executed by the processor 102 or the controller 111 described with reference to FIG.

  As described above, the embodiments have been described as examples of the technology in the present disclosure. For this purpose, the accompanying drawings and detailed description are provided.

  Accordingly, among the components described in the accompanying drawings and the detailed description, not only the components essential for solving the problem, but also the components not essential for solving the problem in order to illustrate the above technique. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential as those non-essential components are described in the accompanying drawings and detailed description.

  Moreover, since the above-mentioned embodiment is for demonstrating the technique in this indication, a various change, replacement, addition, abbreviation, etc. can be performed in a claim or its equivalent range.

  The invention described in this application can be used in an industrial place by being realized as a recording method for recording data on a recording medium or a recording apparatus for recording data on a storage medium.

100 Data recording system 101 Personal computer (PC)
102 processor 103 memory 104 hard disk 105 interface 110 optical disk drive 111 controller 112 memory 113 optical head 114 optical disk 115 interface 201 file 1
202 File 2
203 File 3
204 File N
205 File data of file 1 206 File system management information of file 1 207 File data of file 2 208 File system management information of file 2 209 File data of file 3 210 File system management information of file 3 211 File of file N Data 212 File system management information of file N 213 Pack file 214 File data of pack file 215 Management information of file system of pack file 216 Management file 217 File data of management file 218 Management information of file system of management file 301 First Threshold 302 second threshold

Claims (7)

A recording method for recording data of a plurality of input files on a recording medium,
A file data generation step of selecting a first file from the plurality of input files, and storing data of the first file into pack file data generated according to a file system configured on the recording medium;
A management information generating step of recording management information of the first file on the pack file in a management file;
A recording step of recording the pack file and the management file on the recording medium;
A data recording method comprising: When the data size of the pack file is smaller than a predetermined first threshold,
The file data generation step selects a new second file from the plurality of input files, adds the data of the second file to the data of the pack file,
The management information generation step adds management information of the second file to the management file.
The data recording method according to claim 1. A predetermined second threshold value greater than the first threshold value is further provided;
When the addition of the data of the second file to the data of the pack file is completed, if the data size of the pack file is not less than the first threshold and smaller than the second threshold,
The data recording method according to claim 2, wherein the recording step is executed. If the data size of the pack file is greater than or equal to a predetermined first threshold,
In the file data of the pack file, only the file data of the first file is stored.
The data recording method according to claim 1. The file data generation step performs a predetermined compression process on the data when storing or adding the data to the pack file.
The data recording method according to any one of claims 1 to 4. Information on the directory structure of the plurality of input files is recorded in file system management information of the pack file.
The data recording method according to any one of claims 1 to 5. Information on the directory structure of the plurality of input files is recorded in the management file corresponding to the pack file.
The data recording method according to any one of claims 1 to 5.